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Justification of Red List categoryThis species is listed as Critically Endangered because it has an extremely small range, restricted to one island, where the population exhibits marked population fluctuations, probably owing to climatic events. The accidental introduction of mammalian predators, non-native pest plants, insects or an avian disease, or a stochastic event such as a hurricane could rapidly bring about its extinction.

Recommended citation
BirdLife International (2018) Species factsheet: Telespiza ultima. Downloaded from
http://www.birdlife.org on 20/11/2018.
Recommended citation for factsheets for more than one species: BirdLife International (2018) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 20/11/2018.